Now onto testing the second pattern in my slip project. Butterick 5805. I can't find a year on this pattern, but Wiki vintage patterns dates it as 1951.
These side views shows that the zig-zag seaming under the bust continues around the side.
So what do I think of this pattern? I love the zig-zag seaming. I'm pretty happy with the amount of flare in the skirt. I would need to re-draft the bust cups.